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DC Motors

DC Motors
A dc motor can be easily identified by

Size of conductor
Commutator
Yoke
Winding

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DC Motors
A compensating winding is an auxiliary winding embedded in slots in

The pole faces of main poles
None of the listed here
The armature
Partly in pole faces, partly in armature

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DC Motors
When two dc series motor are commected in parallel, the resultant speed is

More than the normal speed
Zero
Normal speed
Loss than the normal speed

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DC Motors
Which one of the following is not the function of pole shoes in a D.C. machine?

To support the field coils
To reduce the reluctance of the magnetic path
To spread out flux for better uniformity
To reduce eddy current loss

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DC Motors
A series motor will over speed when

The armature circuit is opened.
The load is increase
Load is removed
The field is opened

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DC Motors
A dc series motor is best suited for driving

None of the listed here
Cranes and hoists
Shear and punches
Machine tools

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